Folding knife



FIG. 1 is a front elevation view of a folding knife, showing my new design;

FIG. 2 is a top plan view of the folding knife illustrated in FIG. 1;

FIG. 3 is a rear elevation view of the folding knife illustrated in FIG. 1;

FIG. 4 is a bottom plan view of the folding knife illustrated in FIG. 1;

FIG. 5 is a left end view of the folding knife illustrated in FIG. 1; and,

FIG. 6 is a right end view of the folding knife illustrated in FIG. 1.

The broken line showing of the blade is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a folding knife, as shown and described. 